Grande-Vallée is a municipality in the Gaspésie-Îles-de-la-Madeleine region of the province of Quebec in Canada.

Its name (French for "Great Valley") describes its location in a large fertile valley through which the Grand Vallée River flows.

In 1691, Governor General Frontenac granted the area to François Hazeur, a prosperous merchant from Quebec City. The seignory, called La Grande-Vallée-des-Monts, stretched from Rivière-Magdeleine Seignory in the west to the Saint-Hélier portage in the east. It was inherited by Hazeur's son-in-law, Michel Sarrazin, a surgeon, biologist, and doctor of the King.

No colonization took place until the 1830s, when fishermen of Saint-Thomas-de-Montmagny occupied the place during the summer. In 1842, Alexis Caron and his family, also from Saint-Thomas-de-Montmagny, became the first permanent settlers. In 1846, the mission of Saint-François-Xavier-de-Grande-Vallée was founded. In 1872, the post office opened.

On September 15, 1927, the village was incorporated as a parish municipality, with Arthur S. Fournier as first mayor, although its status as parish municipality was not officially recognized until 1995. In 2005, Grande-Vallée changed its status from parish municipality to just municipality.

The following locations reside within the municipality's boundaries:

• Grande-Vallée-des-Monts (49°10′19″N 65°11′05″W / 49.17194°N 65.18472°W / 49.17194; -65.18472 (Grande-Vallée-des-Monts, Grande-Vallée, QC)) – a hamlet located along Rivière de la Grande Vallée
• L'Anse-à-Mercier (49°13′36″N 65°06′08″W / 49.22667°N 65.10222°W / 49.22667; -65.10222 (L'Anse-à-Mercier, Grande-Vallée, QC)) – a hamlet located on the Saint Lawrence River

The following waterways pass through or are situated within the municipality's boundaries:

• Rivière de la Grande Vallée (49°13′31″N 65°07′39″W / 49.22528°N 65.12750°W / 49.22528; -65.12750 (Rivière de la Grande Vallée, Grande-Vallée, QC)) – a river that empties into Anse de la Rivière de la Grande Vallée
• Lac de la Confrérie (49°11′06″N 65°06′23″W / 49.18500°N 65.10639°W / 49.18500; -65.10639 (Lac de la Confrérie, Grande-Vallée, QC)) – a small lake located 5 kilometres (3.1 mi) southeast of Grande-Vallée village
• Lac du Rocher (49°13′09″N 65°03′47″W / 49.21917°N 65.06306°W / 49.21917; -65.06306 (Lac du Rocher, Grande-Vallée, QC)) – a lake that lies just south of Route 132

Historical Census Data - Grande-Vallée, Quebec

Year Pop. ±% 1931 928 —     1941 827 −10.9% 1951 1,068 +29.1% 1956 1,263 +18.3% 1961 1,490 +18.0% 1966 1,461 −1.9%	Year Pop. ±% 1971 1,412 −3.4% 1976 1,493 +5.7% 1981 1,612 +8.0% 1986 1,561 −3.2% 1991 1,420 −9.0% 1996 1,431 +0.8%	Year Pop. ±% 2001 1,309 −8.5% 2006 1,230 −6.0% 2011 1,137 −7.6% 2016 1,057 −7.0% 2021 1,077 +1.9%
Source: Statistics Canada

Canada Census Mother Tongue - Grande-Vallée, Quebec
Census		Total		French				English				French & English				Other
Year		Responses		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %
2021		1,075		1,065	1.4%	99.1%		5	0.0%	0.5%		0	100.0%	0.0%		0	0.0%	0.0%
2016		1,160		1,050	6.7%	99.1%		5	n/a%	0.5%		5	n/a%	0.5%		0	100.0%	0.0%
2011		1,130		1,125	2.0%	99.6%		0	0.0%	0.0%		0	0.0%	0.0%		5	n/a%	0.4%
2006		1,205		1,205	6.6%	100.0%		0	0.0%	0.0%		0	0.0%	0.0%		0	0.0%	0.0%
2001		1,290		1,290	7.2%	100.0%		0	100.0%	0.0%		0	0.0%	0.0%		0	0.0%	0.0%
1996		1,415		1,390	n/a	98.2%		25	n/a	1.8%		0	n/a	0.0%		0	n/a	0.0%

List of former mayors:

• Arthur S. Fournier (1927–1933)
• Wilfrid Fournier (1933–1945)
• Georges Fournier (1945–1951)
• Robert Lebreux (1951–1959, 1960–1969)
• Rodolphe Fournier (1959–1960)
• Rock Fournier (1969–1978)
• Jean Claude Côté (1978–1986)
• Nelson Fournier (1986–1993)
• Sylvain Bouchard (1993–2005)
• Gabriel Minville (2005–2009)
• Nathalie Côté (2009–2017)
• Noël Richard (2017–present)

• List of municipalities in Quebec

• Media related to Grande-Vallée at Wikimedia Commons
• Official website